Samuel Logan Brengle emphasizes the profound impact of the apostles' preaching in Iconium, attributing their success to three key elements: their manner, matter, and spirit. He highlights that their gracious and persuasive manner won the hearts of many, while their message was filled with the joy and seriousness of the Gospel, calling for repentance and faith in Jesus Christ. Brengle asserts that the right spirit, fueled by love and faith, was the driving force behind their ability to inspire a multitude to believe. He encourages preachers to cultivate a heartfelt connection to God, as it shapes both their message and delivery. Ultimately, Brengle concludes that a heart filled with love for God and others is essential for effective ministry.